D13919: [Fonts KCM] Generate font rendering previews only on X

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, fvogt.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  It uses Xft unconditionally and crashes the entire module when run on Wayland.
  
  BUG: 396214
  FIXED-IN: 5.13.3

TEST PLAN
  Without the previews, the delegate in the combo doesn't fill entire popup width but that's a separate bug and mostly cosmetic and a lot better than the entire thing crashing :)

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D13919

AFFECTED FILES
  kcms/fonts/previewimageprovider.cpp

To: broulik, #plasma, fvogt
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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